Communication device and SRS transmission control method

5. The integrated circuit according to claim 1 wherein the reception circuitry, in operation, controls receiving the SRS transmitted in a first subframe among subframes, which are located at or after a k-th subframe from a subframe in which the control information requesting the transmission of the SRS is detected at the terminal, the subframes being configured based on a periodicity and a subframe offset.

6. The integrated circuit according to claim 1 wherein the transmission parameter indicates one or more of: a bandwidth, a resource block (RB) position where the bandwidth starts, a Cyclic Shift, a transmission Comb, a number of antenna ports, and whether frequency hopping is employed.

7. The integrated circuit according to claim 1 wherein the transmission circuitry, in operation, controls transmitting the control information in a format of a plurality of formats, and the format indicates the transmission parameter.

8. The integrated circuit according to claim 1 wherein the SRS is an aperiodic SRS triggered by downlink control information.

13. The integrated circuit according to claim 9 wherein the receiving includes receiving the SRS transmitted in a first subframe among subframes, which are located at or after a k-th subframe from a subframe in which the control information requesting the transmission of the SRS is detected at the terminal, the subframes being configured based on a periodicity and a subframe offset.

14. The integrated circuit according to claim 9 wherein the transmission parameter indicates one or more of: a bandwidth, an RB position where the bandwidth starts, a Cyclic Shift, a transmission Comb, a number of antenna ports, and whether frequency hopping is employed.

15. The integrated circuit according to claim 9 wherein the transmitting includes transmitting the control information in one of a plurality of formats, and the format indicates the transmission parameter.

16. The integrated circuit according to claim 9 wherein the SRS is an aperiodic SRS triggered by downlink control information.